A Mathematics Lesson Starter Of The Day

The animation showing all of the triangles, one by one, is available above when you are signed in to your Transum subscription account. If you do not yet have an account and you are a teacher or parent you can apply for one here.

A Transum subscription also gives you access to the 'Class Admin' student management system, many more teaching resources and opens up ad-free access to the Transum website for you and your pupils.

I count 51Not double counting anything and remembering that a triangle is just that three angles in which all angles together equal 180 and there is a bunch in there that are not right angles... Would love to know the correct answer though.

- The triangles composed of 3 single triangles were the hardest to find, but u can use the giant(composed of 6 single triangles) triangle to find them; they are all contained in it. - The triangle composed of 4 single triangles are the same triangles as the ones composed of 3 single triangles, except for the fact that they have just added one triangle to the end. - I am unsure how to respond to the person who found 51 triangles other than to say that he/she might have confused the definition of a triangle: A plane geometric figure with three angles and three sides.

Australia Class, Preston, Lancashire, England

Our class found different ways and strategies to solve this puzzle. We found 37 triangles and we enjoyed it! Thank you.

Mr Kavanagh's Fifth Class, Cork, Ireland

Most of the class got lower numbers than 37. The teacher found 27 and when we looked at the answer we realised that there were 37. Abbie got the closest with 30.

Transum,

As you can see by clicking on the button underneath the title at the top of this page we have provided a dynamic answer to this question. The challenge is for pupils to show their solution in a clear, organised way of their own. It could be a static series if diagrams or they too may decide to show their solutiion in a dynamic way using the animation tools of PowerPoint, Prezi or similar. Feel free to send Transum any examples of your pupils' work, we may post them on this page.

How did you use this starter? Can you suggest
how teachers could present or develop this resource? Do you have any comments? It is always useful to receive
feedback and helps make this free resource even more useful for Maths teachers anywhere in the world.Click here to enter your comments.

If you don't have the time to provide feedback we'd really appreciate it if you
could give this page a score! We are constantly improving and adding to these
starters so it would be really helpful to know which ones are most useful. Simply
click on a button below:

Excellent, I would like to see more like this
Good, achieved the results I required
Satisfactory
Didn't really capture the interest of the students
Not for me! I wouldn't use this type of activity.

Your access to the majority of the Transum resources continues to be free but you can help support the continued growth of the website by doing your Amazon shopping using the links on this page. Below is an Amazon search box and some items chosen and recommended by Transum Mathematics to get you started.

Hello World

You are buying a (driverless) car. One vehicle is programmed to save as many lives as possible in a collision. Another promises to prioritize the lives of its passengers. Which do you choose?

Welcome to the age of the algorithm, the story of a not-too-distant future where machines rule supreme, making important decisions – in healthcare, transport, finance, security, what we watch, where we go even who we send to prison. So how much should we rely on them? What kind of future do we want?

Hannah Fry takes us on a tour of the good, the bad and the downright ugly of the algorithms that surround us. In Hello World she lifts the lid on their inner workings, demonstrates their power, exposes their limitations, and examines whether they really are an improvement on the humans they are replacing. more...

Teacher, do your students have
access to computers?Do they have iPads or Laptops in Lessons?

Whether your students each have a TabletPC, a Surface or a Mac,
this activity lends itself to eLearning (Engaged Learning).